电刷镀纳米晶镍铁合金镀层腐蚀特性的研究

Corrosion Characteristic of Nanocrystalline Ni-Fe Alloy Coating Synthesized by Brush Plating

摘要:

采用可溶性阳极电刷镀的方法制备纳米晶Ni-Fe合金和纳米晶Ni镀层，用浸泡法和电化学极化法研究了纳米晶Ni、Ni-5.84%Fe和Ni-13.49%Fe镀层在3.5% NaCl和10% HCl溶液中的腐蚀行为。结果表明：通过此法制备的Ni和Ni-Fe合金镀层具有典型的纳米晶结构；随着含Fe量的增加，镀层的晶粒尺寸减小，硬度增加；所制备的纳米晶Ni-13.49%Fe合金镀层组织结构均匀致密，晶界处没有明显的孔洞或缺陷，晶界及三叉晶界处的原子错配度小，过渡均匀，其在3.5% NaCl溶液中的耐蚀性优于纳米晶Ni镀层，而在10% HCl溶液中的耐蚀性与纳米晶Ni镀层相当；纳米晶Ni和纳米晶Ni-Fe合金刷镀层在3.5% NaCl溶液中的腐蚀形态均为点蚀，而在10% HCl溶液中的腐蚀形态则为均匀腐蚀。

Abstract:

Nanocrystalline nickel and Ni-Fe alloy coatings were synthesized by brush plating using soluble anode. The corrosion characteristics of nanocrystalline nickel, Ni-5.84%Fe and Ni-13.49%Fe alloys were investigated by soak a method and an electrochemical polarization method, respectively. The experimental results indicate that the typical nanocrystalline nickel and Ni-Fe alloy coatings can be synthesized by brush plating, and the alloying element Fe has the effects of solution strengthening and grain size refinement. The nanocrystalline Ni-13.49%Fe alloy is dense in nature and pore free, and exhibits better corrosion resistance in a 3.5 wt% NaCl solution than the nanocrystalline nickel. In 10 wt% HCl solution, the nanocrystalline Ni-13.49%Fe alloy also shows a good corrosion resistance as the nanocrystalline nickel. The surface morphology of all samples after corrosion show a spot corrosion feature in 3.5 wt% NaCl solution, however, the samples are uniformly corroded in 10 wt% HCl solution.